IMG_FILTER_BRIGHTNESS: Changes the brightness of the image. Use arg1 to set the level of brightness.

IMG_FILTER_CONTRAST: Changes the contrast of the image. Use arg1 to set the level of contrast.

IMG_FILTER_COLORIZE: Like IMG_FILTER_GRAYSCALE, except you can specify the color. Use arg1, arg2 and arg3 in the form of red, green, blue and arg4 for the alpha channel. The range for each color is 0 to 255.

IMG_FILTER_EDGEDETECT: Uses edge detection to highlight the edges in the image.

RFC (best current practice status)

RFC (historic status)

RFC (unknown status)

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